Electrode and method for manufacturing the same
An electrode 30 (such as a positive electrode for a lithium ion battery) is provided in which an active material layer ( 35 ), having an electrode active material as a main component thereof, is held by a metallic power collector ( 32 ). A barrier layer ( 33 ) containing a non-water-soluble polymeric material ( 334 ) and a conductive material ( 332 ) is provided on the surface of the power collector ( 32 ). An interconnecting layer ( 34 ), having higher electrical conductivity than the barrier layer ( 33 ) and containing a polymeric material ( 344 ) and a conductive material ( 342 ), is interposed between the barrier layer ( 33 ) and the active material layer ( 35 ).
1. An electrode, comprising:
a metallic power collector;
an active material layer including an electrode active material as a main component being held by the metallic power collector;
a barrier layer provided on a surface of the power collector and containing a non-water-soluble polymeric material and a conductive material; and
an interconnecting layer that is interposed between the barrier layer and the active material layer, has higher electrical conductivity than the barrier layer, and contains a polymeric material and a conductive material,
wherein the barrier layer and the interconnecting layer each contain a granular conductive material, and the relationship between an average particle diameter D B of the granular conductive material contained in the barrier layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship of D B >D C .
2. The electrode according to claim 1 , wherein the active material layer contains a granular conductive material, and the relationship between an average particle diameter D A of the granular conductive material contained in the active material layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship D A >D C .
3. The electrode according to claim 1 , wherein the interconnecting layer contains carbon fibers, and at least a portion of the carbon fibers are arranged between the interconnecting layer and the active material layer and/or between the interconnecting layer and the barrier layer.
4. A battery, comprising the electrode according to claim 1 .
5. A lithium ion battery, comprising the electrode according to claim 1 as a positive electrode.
6. A vehicle provided with the lithium ion battery according to claim 5 .
7. The electrode according to claim 1 , wherein the relationship between a weight ratio R B of the conductive material/polymeric material in the barrier layer and a weight ratio R C of the conductive material/polymeric material in the interconnecting layer satisfies the relationship of R B <R C .
8. The electrode according to claim 7 , wherein the active material layer contains a granular conductive material, and the relationship between an average particle diameter D A of the granular conductive material contained in the active material layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship D A >D C .
9. An electrode, comprising:
a metallic power collector;
an active material layer including an electrode active material as a main component being held by the metallic power collector;
a barrier layer provided on a surface of the power collector and containing a non-water-soluble polymeric material and a conductive material; and
an interconnecting layer that is interposed between the barrier layer and the active material layer, has higher electrical conductivity than the barrier layer, and contains a polymeric material and a conductive material,
wherein the active material layer and the interconnecting layer each contain a granular conductive material, and the relationship between an average particle diameter D A of the granular conductive material contained in the active material layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship D A >D C .
10. The electrode according to claim 9 , the relationship between a weight ratio R B of the conductive material/polymeric material in the barrier layer and a weight ratio R C of the conductive material/polymeric material in the interconnecting layer satisfies the relationship of R B <R C .
11. The electrode according to claim 9 , wherein the interconnecting layer contains carbon fibers, and at least a portion of the carbon fibers are arranged between the interconnecting layer and the active material layer and/or between the interconnecting layer and the barrier layer.
12. A battery, comprising the electrode according to claim 9 .
13. A lithium ion battery, comprising the electrode according to claim 9 as a positive electrode.
14. A vehicle provided with the lithium ion battery according to claim 13 .
15. A method for manufacturing an electrode, in which an active material layer having an electrode active material as a main component is held by a metallic power collector,
the method comprising:
forming a barrier layer on a surface of the power collector by applying a composition for forming a barrier layer, which contains a conductive material, a non-water-soluble polymeric material and a solvent that dissolves the polymeric material, to the power collector;
forming an interconnecting layer onto the barrier layer by applying a composition for forming an interconnecting layer, the composition containing a conductive material, a polymeric material and a solvent that dissolves the polymeric material; and
forming an active material layer onto the interconnecting layer by applying an aqueous active material composition,
wherein the barrier layer and the interconnecting layer each contain a granular conductive material, and the relationship between an average particle diameter D B of the granular conductive material contained in the barrier layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship of D B >D C .
16. The method according to claim 15 , wherein the solvent that composes the composition for forming a barrier layer is an organic solvent.
17. A method for manufacturing an electrode, in which an active material layer having an electrode active material as a main component is held by a metallic power collector,
the method comprising:
forming a barrier layer on a surface of the power collector by applying a composition for forming a barrier layer, which contains a conductive material, a non-water-soluble polymeric material and a solvent that dissolves the polymeric material, to the power collector;
forming an interconnecting layer onto the barrier layer by applying a composition for forming an interconnecting layer, the composition containing a conductive material, a polymeric material and a solvent that dissolves the polymeric material; and
forming an active material layer onto the interconnecting layer by applying an aqueous active material composition,
wherein the active material layer and the interconnecting layer each contain a granular conductive material, and the relationship between an average particle diameter D A of the granular conductive material contained in the active material layer and an average particle diameter D C of the granular conductive material contained in the interconnecting layer satisfies the relationship D A >D C .
18. The method according to claim 17 , wherein the solvent that composes the composition for forming a barrier layer is an organic solvent.